A man pushes a stalled car past a damaged tram in Mariupol, in territory under the government of the Donetsk People's Republic, eastern Ukraine, Saturday, May 21, 2022. (AP Photo/Alexei Alexandrov)

A man stands in a house damaged by shelling in Mariupol, in territory under the government of the Donetsk People's Republic, eastern Ukraine, Saturday, May 21, 2022. (AP Photo/Alexei Alexandrov)

An aerial view of a residential area ruined by the Russian shelling in Irpin close to Kyiv, Ukraine, Saturday, May 21, 2022. (AP Photo/Efrem Lukatsky)

People charge their phones in Mariupol, in territory under the government of the Donetsk People's Republic, eastern Ukraine, Saturday, May 21, 2022. (AP Photo/Alexei Alexandrov)

In this photo taken from video released by the Russian Defense Ministry on Friday, May 20, 2022, a Russian serviceman frisks a Ukrainian serviceman after they leaved the besieged Azovstal steel plant in Mariupol, in territory under the government of the Donetsk People's Republic, eastern Ukraine. (Russian Defense Ministry Press Service via AP)

A young local resident passes by a crater caused by a Russian strike earlier in May opposite an apartment building in Kramatorsk, eastern Ukraine, Saturday, May 21, 2022. (AP Photo/Francisco Seco)

In this photo taken from video released by the Russian Defense Ministry on Friday, May 20, 2022, Ukrainian servicemen are pictured as they leave the besieged Azovstal steel plant in Mariupol, in territory under the government of the Donetsk People's Republic, eastern Ukraine. (Russian Defense Ministry Press Service via AP)

A wedding photograph lies among rubble from a Russian strike earlier in the war in Kramatorsk, eastern Ukraine, Saturday, May 21, 2022. (AP Photo/Francisco Seco)

An aerial view of a residential area destroyed by Russian shelling in Irpin close to Kyiv, Ukraine, Saturday, May 21, 2022. (AP Photo/Efrem Lukatsky)

A man walks next to a theater building that has been bombed, in Mariupol, in territory under the government of the Donetsk People's Republic, eastern Ukraine, Saturday, May 21, 2022. (AP Photo/Alexei Alexandrov)

In this photo provided by the Ukrainian Presidential Press Office, Ukrainian President Volodymyr Zelenskyy, left, greets Portuguese Prime Minister Antonio Costa, during their meting in Kyiv, Ukraine, Saturday, May 21, 2022. (Ukrainian Presidential Press Office via AP)

Residents take out their belongings from their house ruined by the Russian shelling in Irpin close to Kyiv, Ukraine, Saturday, May 21, 2022. (AP Photo/Efrem Lukatsky)

People walk past a destroyed building in Mariupol, in territory under the government of the Donetsk People's Republic, eastern Ukraine, Saturday, May 21, 2022. (AP Photo/Alexei Alexandrov)

Debris cover the kitchen of an apartment damaged during shelling in Kharkiv, eastern Ukraine, Saturday, May 21, 2022. (AP Photo/Bernat Armangue)

Displaced people eat in the basement of a Ukrainian Orthodox church in Kharkiv, eastern Ukraine, Saturday, May 21, 2022. (AP Photo/Bernat Armangue)

Heavily-damaged private houses are seen on the shore of the Sea of Azov in Mariupol, in territory under the government of the Donetsk People's Republic, eastern Ukraine, Saturday, May 21, 2022. (AP Photo/Alexei Alexandrov)

Destroyed trams stand in a depot in Mariupol, in territory under the government of the Donetsk People's Republic, eastern Ukraine, Saturday, May 21, 2022. (AP Photo/Alexei Alexandrov)

Portuguese Prime Minister Antonio Costa, center left, walks surrounded by media and security in Irpin, Ukraine, Saturday, May 21, 2022. (AP Photo/Efrem Lukatsky)